Coin-based homunculi known as the Greeed have awoken from an 800-year slumber! The only hope of stopping them in their pursuit of human desires is a rogue Greeed named Ankh, reduced to the form of a disembodied arm, and the wandering hermit Eiji Hino. Presented with a belt and three Core Medals, Eiji steps forward as the champion of human desire - Kamen Rider OOO!

Season 21 Episode 1 - Medal, Underwear, Mysterious Arm

A mysterious arm reawakens the Greeed from their slumber and decides to use Eiji Hino, a cheerful wanderer, as his means of getting back what he desires as Kamen Rider OOO. Air Date : 5th-Sep-2010  Read More

Season 21 Episode 2 - Greed, Ice Candy, Present

Ankh explains the Greeed and the purpose of the Medals to Eiji, even as the human desires to merely use his new power to fight for good instead of for selfish needs. Air Date : 12th-Sep-2010  Read More

Season 21 Episode 3 - Cat, Evolution, A Glutton

Ankh becomes troubled when Eiji prevents him from eliminating his possessed body's sister while another Greeed uses a man's gluttony to create more Medals. Air Date : 19th-Sep-2010  Read More

Season 21 Episode 4 - Doubt, Photo E-mail, Saving Hand

Ankh threatens to leave OOO for Kazari and the Greeed while investigating the evolution of humanity while Eiji tries to find more about Hina. Air Date : 26th-Sep-2010  Read More

Season 21 Episode 5 - Game of Tag, Nest, Celebrity

Kougami asks for a share of Eiji and Ankh's Medals, while Mezool decides to use Hina's shopaholic classmate to create a new Yummy. Air Date : 3rd-Oct-2010  Read More

Season 21 Episode 6 - Western Clothing, A Contract, Ultimate Combo

Hina confronts Yamano's shopping addiction when her father goes bankrupt while Ankh confronts Kougami about his share deal of the Cell Medals. Air Date : 10th-Oct-2010  Read More

Season 21 Episode 7 - Useless Husband, A Trap, Big Win

Eiji tries to research a husband bullied by his wife that is being mocked by Gamel while Ankh follows a lead for a missing Core Medal. Air Date : 17th-Oct-2010  Read More

Season 21 Episode 8 - Slacking Off, Lack of Ambition, On a Break

Eiji gets to the root of the Komoris' problem involving greed and loss of ambition while Ankh fights for survival after a failed confrontation with Uva. Air Date : 24th-Oct-2010  Read More

Season 21 Episode 9 - Soaked, The Past, Scorching Hot Combo

A serial bomber tied to a nest of Yummies leads to Eiji to reveal his past to Hina and forces him to encounter a strange man he believes is Mezool's victim. Air Date : 31st-Oct-2010  Read More

Season 21 Episode 10 - Fist, An Experiment, Super Bike

Eiji must figure the means of stopping the mad bomber and his Yummies to prevent any more lost lives, even with Maki observing the creation of his worker's monsters. Air Date : 14th-Nov-2010  Read More

Season 21 Episode 11 - Traveler, Swallowtail Butterfly, Celebrity

Eiji's traveler friend becomes manipulated by Uva into becoming famous as he steals others attributes; while Gotou doubts Eiji's effectiveness as OOO. Air Date : 21st-Nov-2010  Read More

Season 21 Episode 12 - Unagi, The World, Heavy-Hitter Combo

Eiji teaches a lesson to Tsukuba and Gotou about going forth to gain what is desired; while Ankh tries to figure a way to manage the flying Ageha Yummy using Gamel. Air Date : 28th-Nov-2010  Read More

Season 21 Episode 13 - Siamese Cat, Stress, Genius Surgeon

Ankh is at a breaking point with everything surrounding his human host; a highly sought after doctor has been repeatedly removed from the operating room, making her frustration a perfect target for the Greeed. Air Date : 5th-Dec-2010  Read More

Season 21 Episode 14 - Pride, Surgery, Secret

Both Hina's brother and the hospital director are in critical condition after Ankh's detachment and the Yummy attack. Eiji must find both Ankh and the affected surgeon before it's too late. Air Date : 12th-Dec-2010  Read More

Season 21 Episode 15 - Struggle for the Medals, Transport Truck, Container

Ankh finds one of his core medals; Gotou is transporting a truck full of medals to Doctor Maki; Kazari appears to Ankh and Eiji, telling them that Hina is in Gotou's truck. Air Date : 19th-Dec-2010  Read More

Season 21 Episode 16 - Conclusion, Greeed, New Rider

Eiji learns about how the Greeed were born; Gamel searches for Mezool; Kamen Rider Birth joins the fight. Air Date : 26th-Dec-2010  Read More

Season 21 Episode 17 - Kendo Girl, Oden, Splitting Yummy

The Greeed take an interest in a girl who wants to get better at kendo; Ankh takes an interest in Kamen Rider Birth; Hina gives both Eiji and Ankh gifts for saving her. Air Date : 9th-Jan-2011  Read More

Season 21 Episode 18 - Destruction, A Reason, Unagi Whip

Eiji and Ankh try to find out the reason that the Yummy split in two, but Kamen Rider Birth is one step ahead of them. Air Date : 16th-Jan-2011  Read More

Season 21 Episode 19 - A Red Medal, A Detective, A Betrayal

Kougami tries to give Eiji one of Ankh's medals, but he refuses; a face from the detective's past shows up at Cous Coussier; thanks to Kazari, a criminal that the detective put away is on the streets and looking for revenge. Air Date : 23rd-Jan-2011  Read More

Season 21 Episode 20 - Decoy, Qualifications, Flaming Combo

Ankh tricks Kazari by telling him that Eiji knows where his last medal is and then chases after Hina who has his own medal; Date and Gotou discuss the skills need to be Kamen Rider Birth; Kougami changes his mind and sends Ankh's medal to Eiji. Air Date : 30th-Jan-2011  Read More

Season 21 Episode 21 - Hopper, Parent and Child, Hero

The Cous Coussier gang runs into a young boy getting attacked for telling off a man for littering, learning that it's something he picked up from his father; the Greeed creates a Yummy from the desire to help people. Air Date : 6th-Feb-2011  Read More

Season 21 Episode 22 - Choco, Conviction, Power of Justice

Susumu lets his desire for justice get out of hand and it's up to Eiji to stop him before it's too late; Gotou and Takashi have a heart-to-heart conversation about their ideals. Air Date : 13th-Feb-2011  Read More

Season 21 Episode 23 - Beauty, Egg, Dormant Desire

Kazari is drawn to the vanity of woman whose sister takes all the credit for her work. Air Date : 20th-Feb-2011  Read More

Season 21 Episode 24 - Memory, Love, Sea Combo

Eiji is head over heels for Yuumi and it's up to Date to save his old friend before she does something that she'll regret. Air Date : 27th-Feb-2011  Read More

Season 21 Episode 25 - Boxer, Left Hand, Bird Yummy

Ankh is acting more standoffish than usual; a boxer is forced into retirement just before a big match and is captured by a bird Yummy. Air Date : 6th-Mar-2011  Read More

Season 21 Episode 26 - Ankh, Ring, Pile on Everything

Eiji is still super beat up from the previous battle but he is the only one who believes that Ankh did not create the bird Yummy; Kazuki heads back to the ring as Date and Gotou rush to stop him from injuring himself more. Air Date : 20th-Mar-2011  Read More

Season 21 Episode 27 - 1000, Movie, Combatant

Kougami invites Eiji and Ankh over to celebrate the 1000th episode of Kamen Rider and decides to make a movie to celebrate; Kazari is drawn to a Shocker grunt who joins the movie. Air Date : 27th-Mar-2011  Read More

Season 21 Episode 28 - 1000, Kamen Rider, Birthday

Even though he's injured, Date still wants to finish directing the movie; Sendou starts sabotaging the movie with his new friends. Air Date : 3rd-Apr-2011  Read More

Season 21 Episode 29 - Older Sister, Doctor, The Truth About Ankh

Kazari uses Dr. Maki's desire to make a Yummy; Gotou goes back to work; a strange monster shows up with Ankh's other arm. Air Date : 10th-Apr-2011  Read More

Season 21 Episode 30 - King, Panda, Memory of Flame

Dr. Maki and Chiyoko have a heart-to-heart talk about his sister; Kazari takes Ankh's memoryless body under his wing; Kougami tells Gotou the story of the medals as Eiji and Date get Ankh to finally tell his story. Air Date : 17th-Apr-2011  Read More

Season 21 Episode 31 - Repaying a Favor, Scheme, Purple Medals

Dr. Maki and Kazari try to awaken a brand new Greeed; a man has been unknowingly using Greeed money to pay off an old debt; Eiji gets infected by purple core medals. Air Date : 24th-Apr-2011  Read More